Orientation Control of the (alpha_2+gamma) Lamellar Microstructure in TiAl Intermetallic Compounds by Thermo-mechanical Treatment

热机械处理对 TiAl 金属间化合物 (alpha_2 gamma) 层状微观结构的取向控制

• 批准号: 07650812
• 负责人: FUKUTOMI Hiroshi
• 金额: $ 1.15万
• 依托单位: YOKOHAMA NATIONAL UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650812/
• 关键词: control of lamellar microstructure; heat treatment; texture; (alpha_2+gamma) microstructure; ラメラ配向; 集合組織; α_2+γ相; α相

A process consisting of the high-temperature deformation in alpha single phase region followed by the annealing and deformation in (alpha_2+gamma) region is examined, in order to control the alignment of the lamellar microstructure with the constituents of alpha_2 and gamma phases in the TiAl based alloys. The uniaxial compression in the alpha single phase region resulted in the formation of a fiber texture, though dynamic recrystallization occurred. The maximum pole density for the compression plane appeared about 35 degrees away from (0001) of the alpha_2 phase. The heat treatment generates the lamellar microstructure reflecting the texture formed by the uniaxial deformation in the alpha single phase region. Work softening was observed at the deformation of the specimen with fully lamellar microstructure formed by the deformation in the alpha single phase region and the annealing in the two phase region. The work softening was attributed to the geometrical softening at the initial stage and dynamic recrystallization in the later stage of deformation. The deformation in the two phase region brought about the rotation of the lamellae. The lamellar interface lied almost parallel to the compression plane after the deformation of about -0.8 in true strain.

为了控制 TiAl 基合金中片状显微组织与 α_2 和 γ 相成分的排列，研究了由 α 单相区高温变形随后在 (α_2+gamma) 区退火和变形组成的过程。尽管发生动态再结晶，但α单相区域的单轴压缩导致纤维织构的形成。压缩平面的最大极密度出现在距 alpha_2 相的 (0001) 约 35 度处。热处理产生反映α单相区域单轴变形形成的织构的层状显微组织。在α单相区变形和两相区退火形成的完全层状显微组织的试样变形时观察到加工软化。加工软化归因于变形初期的几何软化和变形后期的动态再结晶。两相区的变形引起片层的旋转。在真应变变形约-0.8之后，层状界面几乎平行于压缩平面。

项目成果

H Fukutomi et al.: "Analysis of Dynamic Recrystalligation Mechansm inγ-TiAl Intermetallic Compound based on Texture Measinrements" Intermetallics. in print. (1996)

H Fukutomi 等人：“基于织构测量的 γ-TiAl 金属间化合物的动态再结晶机制分析”金属间化合物（1996 年）。

H Fukutomi et al.: "Contral of Lamellar Arrangement in TiAl Allogs by High-tomperatme Deformation in α Single Phase and Subseguent Annerling in Two Phase Region" Materials Transactions, JIM. 36. 610-614 (1995)

H Fukutomi 等人：“通过 α 单相中的高性能变形和两相区域中的后续退火来控制 TiAl 合金中的层状排列”，Materials Transactions，JIM 36. 610-614 (1995)。

福富洋志,大須賀義裕ら: "集合組織に基づくγ-TiAl金属間化合物における動的再結晶機構の解析" 日本金属学会誌. 59. 1215-1221 (1995)

Hiroshi Fukutomi、Yoshihiro Osuka 等：“基于织构的 γ-TiAl 金属间化合物的动态再结晶机制分析”日本金属学会学报 59. 1215-1221 (1995)。

H. Fukutomi. et. al: "Analysis of Dynamic Recrystallization Mechanism in γ-TiAl Intermetallic Compound based on Texture Measurement" Intermetallics. 4. 49-54 (1996)

H. Fukutomi 等人：“基于织构测量的 γ-TiAl 金属间化合物的动态再结晶机制”金属间化合物。

H.Fukutomi, A Nomoto and T.Ohta: "Control of Lamellar Arrangement in TiAl Alloys by High-Temperature Deformation in alpha Single Phase and Subsequent Annealing in Two Phase Region" Materials Trans.JIM. 36. 610-614 (1995)

H.Fukutomi、A Nomoto 和 T.Ohta：“通过 α 单相高温变形和随后两相区域退火控制 TiAl 合金中的层状排列”Materials Trans.JIM。